They appear to be a fault from Rosetta. Looking in the xml files shows the values are accurate.
For example for Nebula the xml shows..
<user>
<id>164960</id>
<name>Nebula</name>
<country>United States</country>
<create_time>1176495768</create_time>
<total_credit>91780480.482980</total_credit>
<expavg_credit>211577.237905</expavg_credit>
<expavg_time>1227527883.831240</expavg_time>
<cpid>3cbb9a0bea282ca485106292f9295fc0</cpid>
<url>www.washington.edu/nebula/whatis.html</url>
<teamid>2612</teamid>
</user>
They are shutdown for maintenance right now, so perhaps that is the cause..
We'll see if they get updated over the next 24 hours..
Bok